(57) Disclosed herein is a transfer material for use with a printer, which comprises a biaxially oriented polyester film which simultaneously satisfies the following expression (I) to (III):
12.0 ≦ F₅ ≦ 17.0      (I)
σ ≦ 0.06 x F₅ - 0.5      (II)
E_p ≧ 4 x 10³ x Δn_p + 250      (III)
wherein F₅ represents the F₅ value (kg/mm²) in the machine direction of said polyester film, σ represents a heat shrinkage (%) in the machine direction of said polyester film after heat treatment at 100°C for 30 minutes, E_p represents a Young's modulus (kg/mm²) in the machine direction, and Δn_p represents a degree of plane orientation of said polyester film, and a transfer ink layer formed on one surface or both surfaces of said polyester film.
The transfer material according to the present invention is of great value in industry because the transfer material is excellent in durability and free from problems such as longitudinal tear and plastic strain. Also, the transfer material of the present invention has a capability of reducing the thickness without impairing the printing property thereof.